Chemical Engineering Mcqs

The catalyst in a second order reversible reaction increases the rate of the forward reaction___________________?

(A) And decreases that of backward reaction
(B) And backward reaction equally
(C) Only
(D) To a greater extent than that of the backward reaction

Submitted By :Ali Uppal

The rate constant of a first order reaction depends on the ________________?

(A) Concentration of the reactant
(B) Temperature
(C) Concentration of the product
(D) Time

Submitted By :Ali Uppal

The units of frequency factor in Arrhenius equation_________________?

(A) Are the same as those of the rate constant
(B) Depend on the order of the reaction
(C) Depend on temperature, pressure etc. of the reaction
(D) Are cycles per unit time

Submitted By :Ali Uppal

The catalytic activity of enzymes is due to their capacity to lower the ______________ energy?

(A) Activation
(B) Potential
(C) Kinetic
(D) None of these

Submitted By :Ali Uppal

In case of _____________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds?

(A) Catalytic
(B) Parallel
(C) Series
(D) Auto catalytic

Submitted By :Ali Uppal

For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be ______________ times?

(A) 8
(B) 16
(C) 1/8
(D) 1/16

Submitted By :Ali Uppal

The effect of increasing pressure on the gaseous equilibrium of the reaction 2X + 3Y ⇌ 3X + 2Y indicates that____________________?

(A) Pressure has no effect
(B) Backward reaction is favoured
(C) Forward reaction is favoured
(D) None of these

Submitted By :Ali Uppal

At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of „E/R‟ ?

(A) 1.6
(B) 2
(C) 2.24
(D) 2.5

Submitted By :Ali Uppal

Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?

(A) DE = DM + DK
(B) 1/DE = 1/DN + DK
(C) DE = DM . DE
(D) DE = DN/DE

Submitted By :Ali Uppal

Which of the following is not a chemical step in a fluid solid catalytic reaction ?

(A) Surface chemical reaction
(B) Adsorption
(C) Desorption
(D) None of these

Submitted By :Ali Uppal

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